Well i can try and help. i wanted to do exactly the same thing - wifi on knoppix. i never figured it out and installed kubuntu anyway. So here is how to set this up and this should hopefully work - im not a hardware person but im guessing that kde will have support.
First - Open KWiFiManager from one of the many menu's - putting that into the konsole should get it too.
Go to Settings => Configuration Editor.
Fill in all the appropriate details
Down the bottom you need to autodetect the device
Then activate the configuration
Then apply
Next open Konqueror
Settings => Internet and Network => Network Settings
Configure the settings and Enable
Then apply
That should give you the wifi and then just start samba or whatever you want and knoppix should be easy on the rest. I hope this works - Im pretty sure it should, onyl problems i can think of could be irritating needing root - and i havent a clue what the knoppix password is - i think it is autogenerated.
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